Temperature regulating system



p 1942- J. 'r. CARLSON 2,296,704

TEMPERATURE REGULATING SYSTEM Filed July 2, 1940 N0 HE/IT Pas/ T ION J L 32a INVENTOR --Jol1n Car/son BY a.d. ATToR EYj Patented Sept. 22, 19 42 UNITED 's-TArE v 2,296,702 TEMPERATURE REGULATING SYSTEM John -T. Carlson, Dayton, Ohio, Master Electric Company, at

Ohio

assignor to The corporation of Application July 2; 1940, Serial No. 343,543 3 Claims. (Cl. 236-74) v This invention relates to improvements in temperature regulating systems and has for an object to improve such systems by providing a basement switch so constructed and arranged that it will be automatically restored to normal position after a predetermined time.

Another object is to provide a basement switch which when moved from normal ineffective position to effective position remains in such effective position together with automatic means for restoring said switch after a predetermined time.

Another object is to provide such a device in which the restoring is initiated by thermal means.

Another object is to provide a signal light to indicate .when the switch is in eifective position.

Another object is to provide such a signal light so associated with a. thermoresponsive switch restoring means that heat therefrom will cause the restoration of the basement switch.

Other objects will appear from the following descriptions of two illustrative embodiments of the invention taken together with the attached drawing wherein:

Fig. 1 shows more or less schematically a heat regulator system showing one manner; of embodying the invention; and

Fig. 2 shows the basement switch parts proper in effective position.

Referring to Fig. 1 of the drawing, the letter T represents a thermostat of any known or suitable form, the one illustrated being of the type shown in Allen A. Dicke Patent 1,854,786 granted April 19, 1932. In the drawing, the numeral II indicates any suitable thermo-responsive element such as a coil of bi-metal operating a contact blade 12 playing between the heat contact [3 and the no-heat contact l4, it being understood that when contact I3 is engaged, the regulator motor, which is usually located in the basement adjacent the furnace or other heat supp y device, is actuated to call for heat so that the draft damper is opened and the check damper closed, whereas when contact I4 is engaged the motor is operated to the no-heat position in which the drafts are closed and the check damper open.

' l5 indicates a signal lamp so associated with the thermal element II as to give a heat anticipating efiect, as will be clearly understood from said Patent 1,854,786. I

Three conductors l6, l1, and I 3 lead respectively from the thermal element, the no-heat contact I4 and the heat contact 13. The heat regulator motor proper comprises an electric motor 20 which through suitable connections 7 including gearing designated 2| serves to operate a shaft 22 which through the usual crank or cranks serves to control the dampers or otherwise effect control of the heating plant. said shaft 22 is a commutator 23 which may be of the form shown. Associated with said commutator are brushes 25, 26, 21, and 28. The

numeral 30 designates generally a source of cur-' rent such as a transformer or battery.

The basement switch proper may consist of switch blade lia engaging with blade lSa connected through conductor is with one side of the driving motor 20, the other side of which is connected by means of conductor 3| to one side of the transformer or battery 30, the other side of which is connected by means of conductor 32 with brush 21. The ends of said blades are shown as contained in an opening 33 in a slidable insulating member 34, one end of which may extend outside of the casing of the furnace regulator mechanism for manual operation, said insulating member being moved upwardly to the position shown in Fig. 2 to make the basement switch effective.

Brush 25 is' connected by means of conductor 25:: with one side-of the motor 20. Brush 26 is connected with conductor I1 which leads to the no-heat contact H. The grounding brush 21 is connected with conductor 32 leading from the transformer, and brush 28 is connected through conductor l8 with the heat contact 13.

The switch blade [9a is formed with a contact 19b which may engage contact 13c connected through'conductor I911 with the lamp 35. Adjacent said lamp is mounted a thermo-responsive switch which may consist of bi-metal 36 movable into engagementwith a, contact 31 upon increase in temperature, which contact 31 is connected throughconductor 31a with conductor l9 and switch-blade Ilia. The thermo metal bar 38 is connected with the conductor I1. Carried by the insulator 3| is a contact 38 which may be L- shaped as shown, which contact through flexible connection 38a is connected with the conductor 39 indicates a lever one end of which interengages with an opening in switch member 3| and the other end of which is positioned for operation by a cam 40 driven by and preferably mounted upon shaft 22.

In the position of the parts'shown in Fig. 1, thefujrnace regulating mechanism is in the noheat position, i. e., with the draft damper closed and the check damper open. If the temperature should fall to an extent where blade l2 of the Rotating with thermostat engages contact I3, a circuit will be established to cause the motor 2. to rotate the shaft 2: one-half turn. This circuit is as follows:

From the transformer via conductor 3| to the electric motor 2', conductor I I, switch blade Iia, switch blade Ila, conductor I, thermo metal II, blade I2, contact l3, conductor II, brush 28, com mutator 23, brush 21, conductor 32, back to the transformer. It will be noted that the said circuit through the thermostat need be maintained only long enough for the commutator 22 to engage withbrush 2i whereupon the half tum operation is completed'even if the thermostat should interrupt the circuit at contact II. The circuit for this Purpose is as former III, conductor 3|, motor 2|, conductor 25a, brush 2!, commutator 23, brush 21, and conductor 32, back to the transformer 2|.

If thereupon the temperature rises, the electric motor 2. will be caused'to operate sufficiently to rotate shaft 22 another half turn, the circuit being the same with the exception that brush 26, conductor I1, and contact II will complete the circuit instead of brush 2|, conductor II, and contact I3. I

If, with the parts in the position shown, (the draft damper closed, check damper open). the user desires to fire the furnace, he will grasp the member ll and pull it upwardly from the position shown in Fig. 1 to the position shown in Fig. 2. Thereby, the switch blades Iia and Ila follows: Transtion to the full use position. rocking lever a which causes the switch member 24 to be pulled in will be separated. However, movement of the blade ISa will cause its contact Ib to engage the contact Ito and the upward movement of contact 3! will cause it to engage switch blade Ila. In the meantime, the lever I! will have been forced to th position shown in Fig. 2.

The movement of the insulating member 34 therefore completes a circuit as follows:

From transformer 30 through conductor ll, motor 20, conductor I9, switch blade "a, contact 38, conductors 38a and II, brush 2!, commutator 23, brush 21, conductor 32, back to the transformer. The motor 2| will therefore be caused to operate until the shaft 22 has rotated one-half turn, causing the draft damper to open and the check damper to close, establishing a proper condition for firing the furnace.

During this time the cam 22 has moved from the full line position to the dotted line position.

It will be noted that the engagement of contact I 91) with contact I9c has established another circuit from the transformer through conductor 3|, motor 20, conductor I9, blade I9a,

contacts I92) and I9c, conductor lid, lamp 3i, conductors 32a and'32, back to the transformer,

causing the lamp 35 to be illuminated. Heat therefrom will, after a certain time, cause the bi-metal 38 to engage contact 31, thus completing a circuit for causing the furnace regulating device to move to the no-heat position, this circuit being as follows:

From the transformer through conductor 3|,- motor 20, conductors I! and 31a, contact 21, bimetal 38, conductor I1, brush 2., commutator 23, brush 21, conductor 32, back to the transformer.

The motor 20 operate therefore to rotate the shaft 22 one-half turn. During this time, the cam is moved from the dotted line posiwardly.

It will thus be seen that a convenient arrangement has been provided whereby if the user should forget to push in the switch member 84, it will be pulled in automatically by means the operation of which is initiated by heat from the lamp II.

Instead of having the switch blade Ila'engage he two contacts lie and II, it is obvious that one of these may be omitted, in which case, the

left contact of the lamp ll will be connected with conductor I8.

The invention is not intended tobe limited to the form shown, which is to be understood as illustrative only and not as limiting, as various and arrangement may within the scope of the changes in construction be made, all coming claims which follow.

I claim:

1. In a heat regulating system, an electrically operated furnace damper controlling mechanism, a thermostat for controlling the actuation of said mechanism, a manually operated basement switch which when operated causes the furnace controlling mechanism to move the draft damper to open position and also closes a circuit including a resistance heater, a thermo-switch closed by heat from said resistance heater so connected as to cause the electric damper controlling mechanism to move to closed draft position and means actuated by said damper controlling mechanism only while moving. from draft closed to draft open position to restore said basement switch to original position.

2. In a heat regulating system, an electric motor, a furnac damper controlling mechanism operated thereby, a thermostat for controlling the operation of said motor, a manually operated basement switch which when operated causes the motor to operate to cause the furnace controlling mechanism to move the draft damper to open position and also closes a circuit including a resistance heater, a thermo-switch closed by heat from said resistance heater so connected as to cause the electric motor to drive the damper controlling mechanism to closed draft position and means .actuated by said damper controlling mechanism only while moving from draft closed to draft open position to restore said basement 7 switch to original. position.

3. In a heat regulating Sy tem, an electric mo tor operated furnace damper controlling mechanism. a thermostat for controlling the actuation 1 of said mechanism, a manually operated basement switch which when operated breaks the circuit through the thermostat and establishes a circuit which causes the furnace controlling mechanism to move the draft damper to open position and which switch also closes a circuit including a resistance heater, a thermo-switch closed by heat from said resistance heater so connected as to cause the electric damper controlling mechanism to move to closed draft position and means actuated by said damper controlling mechanism only while moving from draft closed to draft open position to restore said basement switch to original position.

JOHN T. CARISON. 

